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the swirl port thing sort of worries me..it looks like they take up a lot of room, and the serious heads dont have them.
Are you talking about the rotator on the exaust valve? If you are it will cause problems even with a small performance cam.... I have a head with a hole in it to prove it. One of my valves broke at the retainer (from coil bind?)fell down in the cyl. bent the rod n punched a stem sized hole in the head. 
ive already eliminated the rotators, mostly due to the weight. there is a "wing" thing in the intake to steer the air for swirl. im thinking cutting this back to about 1/4 to 3/8 inch just to move the air around the valve guide.
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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